Table 2.

Striatal MPP⁺ levels in WT and PARP^−/− mice

	MPP+ levels, μg/gm striatum
	90 min	120 min	240 min
WT	3.33  ±  0.35	1.95  ±  0.38	0.44  ±  0.06
PARP−/−	3.03  ±  0.35	2.12  ±  0.28	0.40  ±  0.13

MPP⁺ levels were determined at the times indicated after treatment with MPTP. Data are the means ± SEM, n = 3 for each value. No significant difference exists in MPP⁺ levels (two-way ANOVA) between PARP^−/− or WT.